Hi
I purchased a rebel XTi and the EFS 17-55 lens some time ago. I never used the flash until a few months ago and have been getting an annoying lens shaped shadow at the center bottom of a lot of the photos. I asked Canon about it and they are "looking into it" They claim that the rebel XTi and this lens should not be doing this. Has anyone else had this issue?
Thanks for your time.

I didn't use a lens hood. I was just using the pop up flash. Cannon asked me to try it without a filter - that didn't change anyting - For the "test" photos I sent Canon I used a tipod with the timer so there was no shake and no fingers.